A Step-by-Step Checklist for Judging Any Fund

To choose an ETF, start with the job you need it to do, then compare funds that do that job on cost, the index they track, size, trading costs, how closely they follow their index and what they actually hold. Most of the time, the right choice is a broad, low-cost fund from a large provider, and the wrong choice is whichever fund is trending this week.

There are now thousands of ETFs, and many of them look almost identical from the outside. The differences are in the details: a fee that looks tiny, a structure that behaves differently in a crash, or a fund that holds far fewer companies than its name suggests.

This guide gives you a step-by-step checklist for judging any ETF, shows with real numbers how much each detail is worth, and walks through a worked example comparing three of the most popular funds in the world.

Start Here: Learn to Judge Any Fund

Financial Regulation Courses (FRC) is a financial education provider with its roots in regulation and professional training. FRC sells no investments, manages no money and earns no commission on any fund, so its courses teach you how to judge funds for yourself rather than telling you what to buy.

ETF Investing for Beginners teaches you how ETFs work, what they really cost and how to choose one. ETF Investing Strategies teaches you to plan, build and manage a complete ETF portfolio, and Advanced ETF Investing covers rebalancing, tax placement, risk and complex funds.

FRC’s programs and memberships are open to everyone. Each course can be taken on its own, and interest-free payment plans let you spread the cost over two, three or four months.

How FRC’s Courses Teach Fund Selection

Part 2 of ETF Investing for Beginners, Costs, Trading and Risk, covers exactly the details this checklist relies on: what ETFs really cost, how to trade them safely and the risks to understand before you invest. Part 3, Choosing and Building, then teaches you how to choose an ETF and put your first portfolio together.

Every chapter ends with a 15-question assessment with an 80% pass mark, and the next chapter only unlocks once you pass. By the time you reach the choosing stage, you can read a fund’s documents with confidence instead of relying on its marketing.

FRC uses AI teachers to present its video lessons in the FRC dictionary, so every lesson is delivered to the same high standard, every time, instead of depending on whichever instructor happens to be teaching. Every lesson is reviewed by qualified finance and compliance professionals before it is published.

The ETF Checklist

Use this checklist on any exchange-traded fund before you buy it. Each step is explained in more detail below.

Quick Benchmarks to Use

The checklist tells you what to look at. The table below gives FRC’s rule-of-thumb benchmarks for a core, long-term holding, so you know what the numbers should roughly look like.

These are guidelines, not rules. A specialist fund can sensibly fall outside them, as long as you know exactly why you hold it.

Step 1: Decide What the Fund Is For

Every ETF in your portfolio should have a job. A broad US stock fund might be your core, an international fund might spread your risk across the world, and a bond fund might steady the ride.

If you cannot describe a fund’s job in one sentence, you probably do not need it. FRC’s guide to how many ETFs you should own shows how quickly extra funds turn into overlap rather than diversification.

Step 2: Understand the Index It Tracks

Most ETFs are index funds that follow a set of rules for which companies to hold and in what proportion. Two funds with similar names can track very different indexes, so always check which one.

Check first whether the fund is passive or active. A passive fund simply follows its index, while an active ETF has managers trying to beat a benchmark, which usually means higher fees and no guarantee of success.

A total US market fund holds thousands of companies of every size, while an S&P 500 fund holds the 500 largest.

Weighting matters too. Most index funds are weighted by market value, so the largest companies carry the most weight, while equal-weighted funds give every company the same share. A growth fund, a dividend fund and an equal-weighted fund each tilt the portfolio in a different direction, and that tilt decides how the fund will behave.

Read the fund’s prospectus or fact sheet to see the index, how often it rebalances and any limits on how much one company can make up. Two minutes spent here prevents most nasty surprises later.

Step 3: Compare the Cost

The expense ratio is the annual fee, taken out of the fund’s assets every day. It looks small, but it compounds against you for as long as you hold the fund.

FRC calculated what different fees do over 30 years, assuming 8% growth a year before fees.

The gap between 0.03% and 0.75% is more than $181,000 on a single $100,000 investment. Even the small difference between 0.03% and 0.0945%, the fees of two of the world’s most popular S&P 500 ETFs, is worth about $17,700 over 30 years.

For context, the Investment Company Institute reported an asset-weighted average expense ratio of about 0.14% for index equity ETFs in 2025, which means most money already sits in very low-cost funds. Cheaper is not automatically better if two funds do different jobs. But when two funds track the same index, the lower fee almost always wins over time.

Step 4: Check Size and Track Record

A fund’s size, measured by the assets it manages, tells you how many investors trust it and how likely it is to survive. Very small funds are more likely to close, which can force you to sell at an inconvenient time and possibly trigger a tax bill.

A long track record also lets you see how the fund behaved in real crashes, such as 2008, 2020 and 2022. A new fund with a clever idea has never been tested.

Step 5: Look at Trading Costs

Every time you buy or sell an ETF, you pay the bid-ask spread, the gap between the price buyers are offering and the price sellers are asking. For the largest ETFs, it is usually a fraction of a cent per share, while thinly traded funds can have much wider spreads.

Check the fund’s average daily trading volume and its typical spread before buying. Using a limit order rather than a market order protects you from paying more than you intended, especially in a fast-moving market.

Also check that the fund trades close to its net asset value, the value of the investments it holds. Large, popular ETFs rarely stray far from it, while small or specialist funds can trade at noticeable premiums or discounts.

Step 6: See How Closely It Tracks Its Index

A good index fund should return almost exactly what its index returns, minus its fee. The gap between the two is known as tracking difference, and the variation in that gap over time is called tracking error.

Fund documents and fact sheets show the fund’s returns alongside its index. If a fund consistently lags its index by much more than its fee, something in how it is run is costing you money.

Step 7: Look Inside at the Holdings

The name on the fund does not always tell you what is inside. A “technology” fund might be dominated by a handful of giant companies, and a “dividend” fund might be heavily concentrated in one or two sectors.

Check the number of holdings, the weight of the top ten and the sector breakdown. A fund whose top ten holdings make up a large share of its assets carries far more single-company risk than its name suggests.

Then compare those holdings with the funds you already own. If the same companies appear near the top of every fund, you are adding concentration, not diversification.

Step 8: Check the Structure

Not everything that trades like an ETF is a standard ETF. Exchange-traded notes are debt issued by a bank, so you take on the bank’s credit risk, while commodity funds that hold futures contracts can behave very differently from the commodity’s spot price.

Outside the US, many ETFs also differ in how they copy their index. A physically replicated fund buys the actual stocks or bonds, while a synthetic fund uses swap contracts with a bank to deliver the index return, which adds the risk that the bank fails to pay.

Leveraged and inverse ETFs are built to deliver a multiple of a market’s daily return, and they reset every day. Over longer periods they can lose value even when the market rises, which is why FRC’s guide to leveraged ETFs explains why they are rarely suitable for long-term investors.

Step 9: Think About Tax

Most broad index ETFs are tax-efficient, because their structure allows them to avoid passing on most capital gains. Some funds, especially actively managed or high-turnover ones, still distribute gains that you must pay tax on, even if you never sell.

Where you hold a fund matters too. Funds that pay a lot of income, such as bond funds, are often better held in a 401(k) or IRA, while broad stock ETFs are usually efficient in a taxable account. FRC’s guide to tax-efficient ETFs covers this in detail.

Investors outside the US should also check where a fund is legally based, known as its domicile. It can change how much withholding tax is taken from the fund’s dividends.

Many funds sold in the UK and Europe also come in two versions. Distributing share classes pay dividends out to you in cash, while accumulating share classes reinvest them automatically inside the fund, and each can be taxed differently depending on where you live.

A Worked Example: Three S&P 500 ETFs

The three largest S&P 500 ETFs all track the same index of 500 large US companies. The checklist shows how they still differ.

SPY is the oldest ETF in the US and one of the most heavily traded securities in the world, which makes it popular with professional traders. Its trust structure, however, does not let it reinvest dividends between payments, and its fee is roughly three times higher.

SPY’s trust structure also prevents it from lending out the stocks it holds to other investors, something open-end funds such as IVV and VOO can do to earn a little extra income that helps offset their costs.

On a $50,000 investment, the yearly fee is about $15 for IVV or VOO and about $47 for SPY. That gap looks trivial in a single year, but it repeats every year and compounds.

For a long-term investor buying and holding, IVV and VOO offer the same index at a lower cost. The difference of about 0.06 percentage points a year is worth about $17,700 on $100,000 over 30 years, as the fee table above shows.

FRC’s comparisons of SPY vs VOO and VOO vs IVV go through each pairing in full.

Red Flags When Choosing an ETF

Common Mistakes When Choosing an ETF

The most common mistake is choosing by last year’s return. A fund that topped the charts last year is often concentrated in whatever just performed best, and leadership changes without warning.

The second is ignoring cost because the numbers look small. As the fee table shows, fractions of a percent turn into tens of thousands of dollars over a lifetime.

The third is buying a fund without looking inside it, and the fourth is buying several funds that hold the same companies. Each of these mistakes comes from the same gap: choosing funds without a clear method. That is precisely the gap a structured course closes.

Questions People Ask

How do I choose a good ETF? Start with the job the fund needs to do, then compare funds that do it on cost, index, size, trading costs, tracking and holdings. A broad, low-cost fund from a large, established provider is usually a strong starting point.

What is a good expense ratio for an ETF? For broad index ETFs, fees of 0.10% a year or less are common, and some charge as little as 0.03%. Specialist and actively managed ETFs usually charge more, so compare a fund with others of the same type.

What is the best ETF for beginners? There is no single best fund, and FRC does not recommend specific funds. Many beginners start with one broad, low-cost fund, such as a total US market or S&P 500 ETF, because it is simple and widely diversified.

Is a bigger ETF always better? Not always, but size helps. Larger funds tend to have narrower spreads, more trading and less risk of closing, although a smaller fund tracking a different index may still be the right choice for a specific job.

How do I know if an ETF is liquid? Check its average daily trading volume and its bid-ask spread. Remember that an ETF’s liquidity also depends on the investments it holds, which is why funds of large, heavily traded stocks are usually the easiest to trade.

What is the difference between an ETF and an ETN? An ETF owns the underlying investments, while an exchange-traded note is a debt promise from a bank to pay the return of an index. That means an ETN carries the risk that the issuing bank cannot pay.

Should I choose an ETF or a mutual fund? Both can hold the same index. ETFs trade during the day and are usually more tax-efficient in a taxable account, while mutual funds can be convenient for automatic investing in exact dollar amounts.

How do I compare two ETFs that track the same index? Look at the expense ratio first, then trading costs, size and tracking difference. When everything else is similar, the lower-cost fund usually delivers more over time.

What should I look for on an ETF fact sheet? Check the index, the expense ratio, total assets, the launch date, the number of holdings, the top ten holdings and their weight, and the fund’s returns compared with its index. Together they cover most of the checklist above in a single page.

How do I choose an ETF as a beginner? Start with one broad, low-cost index fund as your core, check that it passes the benchmarks above, and only add more funds once you can say exactly what each one adds. Learning the checklist properly before you buy is far cheaper than learning it from mistakes.

What is the 70/30 rule for ETFs? It usually means holding 70% of a portfolio in stock ETFs and 30% in bond ETFs. It is a choice about risk, made before you choose individual funds to fill each part.

Which ETFs are best for dollar-cost averaging? Broad, low-cost index ETFs suit regular investing best, because a low fee and a tight spread matter more when you buy often. FRC’s guide to dollar-cost averaging vs lump sum explains how regular investing works.

How does an ETF make money? The fund company earns its income mainly from the expense ratio, and some funds also earn a small amount from lending out the securities they hold. As an investor, you make money from the rising value of the fund’s holdings and from any dividends they pay.

What is the difference between a unit investment trust and an ETF? A unit investment trust is a fixed legal structure, and some ETFs, including SPY, are organized as one. Unlike most ETFs, which are open-end funds, a trust cannot reinvest dividends between payments or lend out the stocks it holds.

How much should I invest in one ETF? That depends on its job in your portfolio. A broad core fund can hold most or all of your money, while narrower funds are usually kept to a smaller share.

The Bottom Line

Choosing an ETF comes down to a simple method: give the fund a job, then compare the funds that do that job on cost, index, size, trading costs, tracking, holdings, structure and tax. The fee alone can be worth tens of thousands of dollars over a lifetime, and the structure can decide whether a fund protects you or surprises you.

The fund that is trending is rarely the one that serves you best. Learn to judge any fund with confidence through ETF Investing for Beginners, then build and manage a complete portfolio with ETF Investing Strategies and Advanced ETF Investing.